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Source potential and depositional environment of Oligocene and Miocene rocks offshore Bulgaria

By
J. Mayer
J. Mayer
OMV Exploration and Production GmbH, Trabrennstraße 6–8, A-1020 Vienna, AustriaChair of Petroleum Geology, Montanuniversitaet Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria
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B. J. Rupprecht
B. J. Rupprecht
Chair of Petroleum Geology, Montanuniversitaet Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria
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R. F. Sachsenhofer
R. F. Sachsenhofer
Chair of Petroleum Geology, Montanuniversitaet Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria
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G. Tari
G. Tari
OMV Exploration and Production GmbH, Trabrennstraße 6–8, A-1020 Vienna, Austria
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A. Bechtel
A. Bechtel
Chair of Petroleum Geology, Montanuniversitaet Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria
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S. Coric
S. Coric
Geological Survey of Austria, Neulinggasse 38, A-1030 Vienna, Austria
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W. Siedl
W. Siedl
OMV Exploration and Production GmbH, Trabrennstraße 6–8, A-1020 Vienna, Austria
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W. Kosi
W. Kosi
OMV Exploration and Production GmbH, Trabrennstraße 6–8, A-1020 Vienna, Austria
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J. Floodpage
J. Floodpage
Total E&P, Place Jean Millier, La Défense 6, Paris La Défense Cedex, 92078, France
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Published:
January 01, 2018

Abstract

Oligo-Miocene (‘Maikopian’) deposits are considered the main source rocks in the Black Sea area, although only a few source-rock data are available. Geochemical logs from nine wells are used together with age constraints provided by calcareous nannoplankton, well and seismic data to determine vertical and lateral changes of the source potential. Oligocene rocks overlie Eocene deposits with a major unconformity on the western Black Sea shelf in Bulgaria. A west–east-trending erosional structure (the Kaliakra canyon) developed during Lower Oligocene time and was filled with Oligo-Miocene deposits. Potential source rocks are present in different stratigraphic units, but the most prolific intervals accumulated during time intervals when the isolation of the Paratethys resulted in oxygen-depleted, brackish environments with high bioproductivity. These include Lower Solenovian rocks related to blooms of calcareous nannoplankton, which form an extensive layer outside the Kaliakra canyon. This unit hosts a good potential to generate oil and gas. Diatom-rich, very good oil-prone source rocks accumulated during a second isolation event in the Kozakhurian. Thick sections of these diatom-rich rocks occur within the canyon and are present in thin layers outside of it. High productivity of siliceous organisms is attributed to upwelling within the canyon. All studied units are thermally immature on the shelf.

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Geological Society, London, Special Publications

Petroleum Geology of the Black Sea

M. D. Simmons
M. D. Simmons
Halliburton, UK
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G. C. Tari
G. C. Tari
OMV, Austria
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A. I. Okay
A. I. Okay
Eurasia Institute of Earth Sciences, Turkey
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Geological Society of London
Volume
464
ISBN electronic:
9781786203724
Publication date:
January 01, 2018

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